Abstract:

Objective To compare the fracture resistances of pulpless teeth restored with FRC(Fiber Reinforced Composite) posts and three kinds of resin core material. Methods A total of 42 recently extracted upper incisors were randomly divided into 3 groups. Group A~restored with prefabricated glass-fiber posts and Artglass polymer core;group B with prefabricated glass-fiber posts and Charisma composite resin core; and group C with prefabricated glass-fiber posts and AB composite resin core.In every group, the core material was processed by hot-press and non hot-press respectively. The posts size and shape were identical in the 3 groups. All teeth were fully covered with polycarbonate resin crowns. Fracture resistance was mesasured by applying point force at 130 degrees to the long axis of the teeth on an universal testing machine. Results Mean fracture threshold was 505.4 N 士42.0 N and 564.1 N士41.7 N in group A, 411.3 N土23.3 N and 315.3 N士19.1 N in group B and 358.4 N土36.1 N and 423.4 N土47.5 N in group C. In all groups, there was no posts fracture and polycarbonate resin crowns fragmentation. Condu- lion The composite restoration of FRC posts combined with resin core and resin crown can improve the fracture resistance of the pulpless roots. The strength of resin core material can be increased by hot-press methods.

Key words: fiber reinforced composite, post and core restoration, composite resin core material, root fracture, fracture resistances